we already have the barcode maker that can scan but we dont know how to save it to an attendance using excel.

First, after decades of use and time, no one I know implements new apps in Visual Basic. It's more likely to be VB.Net.

Second, no one I know will use Excel as the underlying database. Our apps use MySQL if the data is expected to be more than a thousand records.

Finally, in your app, provide a feature to export to an Excel compatible file. CSV (comma seperated values) is trivial and easy.

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